Gigantosaurus was the biggest meat-eating animal that ever walked the Earth. Gigantosaurus was a massive 50 feet(15 meters)long, and weighed 7 tons. And it lived in Patagonia, Argentina 100 million years ago in the early Cretaceous Period. Thank goodness Gigantosaurus, Spinosaurus, and T-rex don't live right now in the same place, then there would be a battle every day!